LM3705 Datasheet | National Semiconductor

Description The LM3704/LM3705 series of microprocessor supervisory circuits provide the maximum flexibility for monitoring power supplies and battery controlled functions in systems without backup batteries. The LM3704/LM3705 series are available in MSOP-10 and 9-bump micro SMD packages. Built-in features include the following: Reset: Reset is asserted during power-up, power-down, and brownout conditions. RESET is guaranteed down to VCC of 1.0V. Manual Reset Input: An input that asserts reset when pulled low. Power-Fail Input: A 1.225V threshold detector for power fail warning, or to monitor a power supply other than VCC. Low Line Output: This early power failure warning indicator goes low when the supply voltage drops to a value which is 2% higher than the reset threshold voltage. n n n n n n n n n No external ponents required Manual-Reset input RESET (LM3704) or RESET (LM3705) outputs Precision supply voltage monitor Factory programmable Reset Timeout Delay Separate Power Fail parator Available in micro SMD package for minimum footprint ± 0.5% Reset threshold accuracy at room temperature ± 2% Reset threshold accuracy over temperature extremes n Reset assertion down to 1V VCC (RESET option only) n 28 µA VCC supply current Applications n n n n Embedded Controllers and Processors Intelligent Instruments Automotive Systems Critical µP Power Monitoring Features n Standard Reset Threshold voltage: 3.08V n Custom Reset Threshold voltages: For other voltages between 2.2V and 5.0V in 10m V increments, contact National Semiconductor Corp. Typical Application © 2002 National Semiconductor Corporation DS101369 .national. LM3704/LM3705 Connection Diagram Top View (looking from the coating side) micro SMD 9 Bump Package BPA09 MSOP-10 Pin Description Pin No. micro SMD A1 B1 C1 MSOP 2 1 10 Name MR VCC RESET Function Manual-Reset input. When MR is less than VMRT (Manual Reset Threshold) RESET/RESET is engaged. Power Supply input. Reset Logic...